We will see a warmer weather pattern in the Northeast and over the Atlantic this fall. With it being drier and warmer, the Northeast and northern Plains will be the worst for ragweed. Pollen counts in the Northeast began to rise later than normal this year. But because the fall season is expected to be warmer than average, the ragweed season could last longer than normal despite the late start.
Due to the warmer weather and the extreme weather caused by Hurricanes Irma and Harvey, the mid-Atlantic and northern parts of the Southeast will see a spike in ragweed growth. The areas affected the most by the hurricanes will see higher-than-normal weed pollen levels. While rainfall can wash away pollen temporarily, the increased moisture also causes the plants to continue growing.
We will see conditions much higher than normal for weed pollen from Kentucky and Tennessee through North Carolina and into Virginia and even southern Pennsylvania. This region looks to be the worst pollen areas for the fall.
The mid-Atlantic can expect to see elevated ragweed pollen counts until mid-October to early November, and the Northeast may suffer until late September. Aside from ragweed, mold spores will be the second-most common cause of fall allergies. Those who suffer from asthma are also more susceptible to respiratory issues prompted by these sources.